The "Tableau Économique" is a foundational economic model developed by the French economist François Quesnay in the 18th century. It visually represents the flow of goods and services within an economy, illustrating the relationships between different sectors, such as agriculture, manufacturing, and commerce. This model emphasizes the importance of agriculture as the primary source of wealth and economic activity. In the Tableau, the economy is depicted as a circular flow, where each sector contributes to and benefits from the others. This framework laid the groundwork for later economic theories and models, influencing thinkers like Adam Smith and Karl Marx in their analyses of economic systems.